Dental Materials

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Dental Materials
2011-02-04 06:31:37

chapter 5 principles of bonding
Show Answers:

  1. _____ ______ establish micromechanical retention with enamel and or dentin by adapting to relief areas created by conditioning with ______ acid on teeth to get retention
    • dentin resins
    • phosphoric acid
  2. BIS-GMA=
    BISphenol a Glycidyl MethAcrylate
  3. what are the six steps to bonding?
    • 20 second etch on enamel and 10 on denth
    • rinse
    • dry (leave dentin moist)
    • application
    • air thin
    • polymerization
  4. t/f the dentin must be dry before bonding application
    FALSE-leave dentin moist
  5. what are two types of dentin resins
    • BIS-GMA
    • urethane dimethacrylate
  6. light activated polymerization allows for what?
    flexible working time
  7. polymerization initiators are typically _____ ______ or a _____ ____
    • benzoyl peroxide
    • tertiary amine
  8. what can be used to prevent contamination (hint rubber up)
    Rubber Dam
  9. what are bonding failures commonly due to?
    contamination by saliva or oils
  10. what must be done if contamination occurs at any step of the process?
  11. what removes tooth minerals to create porosity?
    phosphoric acid
  12. resin tags lock into the tooth to create why type of a bond?
  13. resin to ____ or resin to ____ will always be a _____ bond
    • tooth
    • metal
    • mechanical
  14. what type of bond does a composite resin have?
  15. _____ to ______ will always be a chemical bond
    resin to resin
  16. ____ _____ increases ability of liquids to wet tooth surfaces (what is this called?)
    • acid etch
    • wetting
  17. t/f the etching time for primary teeth is 20-30 seconds
    FALSE 60 seconds
  18. how long should primary teeth be etched and why?
    • 60 seconds
    • enamel of primary teeth are amorphic (not regular)
  19. what does amorphic mean?
    not regular
  20. how long should the dentin be etched for? (hint half of enamel)
    10 seconds
  21. what does longer etching time on the dentin do?
    decreases bond strength and increases hypersensitivity
  22. what happens to the matrix if the dentin is etched too long?
    lays down flat and does not make mechanical bond
  23. resin primer penetrates etched dentin and enamel creating a _____ bond and resin adhesive bonds ______ to primer
    • mechanical
    • chemically
  24. what are the two components of bonding agents?
    • primer
    • resin adhesive
  25. t/f primer is more important to enamel than dentin
    FALSE more important to dentin than enamel
  26. primer contains _______ groups to help bonding dentin why?
    • hydrophilic
    • because dentin is wet
  27. what kind of bond is formed between primer and dentin?
    mechanical bond
  28. _____ _____ binds chemically to primer
    resin adhesive
  29. what kind of bond is created between resin adhesive and primer
  30. resin adhesive contains ______ groups that chemically bond to composite resin
  31. what type of bond does resin adhesive have with metals/porcelain?
  32. t/f resin adhesive contains hydrophilic groups that chemically bond to composite resin
    FALSE hydrophobic
  33. t/f primer binds chemically to dentin
    false mechanically
  34. Resin to resin =?
    chemical bond
  35. resin to metal or porcelain=?
    mechanical bond
  36. what two things does resin mechanically bind to?
    • tooth
    • metal/porcelain
  37. t/f dentinal bonding is stronger than enamel bonding (think about it! to....make you.........think)
    FALSE enamel is stronger!
  38. what happens if blood comes in contact with the tooth during bonding? what about saliva? or water? or snot?
    Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch, Re-Etch for 15 seconds
  39. when you Re-Etch because of contamination how long must the etch be applied for?
    15 seconds
  40. what is the layer called that forms on the surface of cut dentin and enamel from cavity preparation with rotary or hand instrument?
    smear layer
  41. what is the smear layer composed of? (6)
    • tooth structure
    • plaque
    • bacteria
    • pellicle
    • saliva
    • blood
  42. how is the smear layer removed?
    rinse with waters
  43. t/f the smear layer does not effect bonding
    false- must be removed before bonding use water
  44. t/f keeping dentin moist keeps the collagen fibers fluffed up
    True (its so fluffy I could die)
  45. if collagen fibers collapse they occlude the _____ _____, block penetration of _____ _____ _____, and results in dentin/resin interface ______
    • dentinal tubules
    • dentin bonding resins
    • fracture
  46. what is dissolved in resins to allow resins to penetrate through water and collagen fibrils into porosities created by etching
  47. what is the job of a solvent in dentin bonding?
    it is dissolved in resin to allow resin penetration through water and collagen fibers
  48. what is the hybrid layer?
    layer formed by dentin bonding resin and collagen fibrils
  49. how is the bond between dentin and restorative material made?
    through the hybrid layer
  50. what is defined as leakage of fluids and bacteria between tooth and restoration?
  51. microleakage can cause? (6)
    • decay under restoration
    • tooth sensitivity
    • shrinkage of composite resins
    • unbound amalgam
    • coefficient of thermal expansion (materials expand and contract with temp at different rates than tooth)
  52. what results from microleakage ? (3)
    • recurrent decay
    • staining
    • post operative sensitivity from percolation
  53. the _______ extends into the dentinal tubule and reacts to pressure changes causing pain. What is this theory called?
    • odontoblasts
    • hydrodynamic theory of tooth sensitivity
  54. what is the primary reason for tooth sensitivity following bonding procedures?
    incomplete seal of the dentin
  55. what are three contributing factors to hypersensitive teeth?
    • over drying (traps air in tubules)
    • dentin over etched (flattens collagen)
    • composite cured in too large of increments (contraction stress on tooth)
  56. what size increments can composite resins be laid in?
  57. laying down small increments of composite lessens what?
  58. etching dentin with phosphoric acid dissolves what to create porous surface?
    hydroxy-apatite mineral
  59. what are the three modes of curing?
    • self cure
    • light cure
    • dual cure
  60. ______ is typically activated by fiber optic light